Electrical-conductor-protecting means



July 3, 1928.

v G. P. EDMONDS ELECTRICAL CONDUCTOR PROTEGTING MEANS v Filed Nov. 2, 1925 5MM E .Patented -July 3, 1928.

UNITED STATES PATENT OFFICE.

GEORGE P.' EDMONDS, OF CHICAGO, ILLINOIS,

ASSIGNOR TO G. W. ELECTRIC SPE- CIALTY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.

ELECTRICAL-CONDUCTOB-PBOTECTING MEANS.

Application led November 2, 1925. Serial No. 66,165.

This invention relates to electrical conductor protecting means.

One object of the invention is to provide simple and efficient enclosure protecting means for electrical conductors arranged to prevent the passage of moisture along the threads of the threaded members and into the enclosure to protect insulation of the elect-rical conductors from rupturing.

Another object is to provide a moistureproof ca arrangement for a casing or bush-v ing in w ich an insulated electrical conductor is placed to maintain the dielectric strength of such insulation.

These and other objects are accomplished Aby means of the arrangement disclosed on t-he accompanying sheet o f drawings, in'

Figure 1 is afront elevation, parts being in section, of\a non-disconnecting pothead embodying my invention; and,

' .Figurej2 isv a'sectional View taken in the -iplane' offline 2-2 of Figure 1.'A

While I have disclosed my invention particularlyin connection with a pothead, it is A to be understoodthat'the invention is to be considered broadlywith respect to any casing for enclosure for. insulated` electrical conductors. I' In the particular arrangement shown, it will be noted that the invention is illustrated in connection wit-h a pothead including a orcelain bushing 10, to the lower part of w ich al metal threaded ring 11- is secured by 35 cap 13 being screwed onto the ring 11.- Said `cap is provided with a plug 14 whlch may be removed vfor filling the cap and bushing with cement 12 or the like, an insulating containing liquid insulating material. The electrical cable or conductor 15 enters the tapered end of the cap 13 and extends upwardly through the bushing 10 and is electrically connected tothe lower endof an electrical connector 16 having projections 17 which are anchored to a brass anchor ring 18 suitably secured in the upper part of the bushing '10 by cement 19 or the like. As is customary, adjacent the end of the conductor which is electrically connected to the connector 16 the wrapped insulation 20 around the conductor is removed andthe strands 21 of the cable untwisted sov that they are expanded for the purpose of impre ating same for preventing any moisture w 1ch may enter the top-of the bushing celain.

ATo prevent the admission of moisture' through the top of the casing or porcelain 10,

a moisture-proof covering hasbeen provided. This covering includes a skirted nut 22, the skirt 23 of which passes down over the top in the formation of arcs of the porcelainlO, said hooded nut havin a threadedl body portion 23 and a threa ed sleeve portion 24 which are screwed onto the threaded portion 25 of the electrical connector for clamping the connector within the porcelain and for securing the hooded nut in a protecting position over the top of the por- The real function of the sleeve 24 will be emphasized later'. The Ahooded nut 22 is metal to form an electrical connection between it and theconnector 16. Mounted over the body portion 23 of the nut 22 and embracing the sleeve 24 thereof is a cable lug 26, and threaded onto the upper end 25 of the connector 16 is a cap nut 27 which presses 29. It will also be noted that the sleeve 24 of thehooded nut 22 extends upwardly a considerable distance beyond the interengaging surfaces at lines 28 and 29 lof the cable lug 26, hooded nut 22 and cap nut 27. It is seen, therefore, that if any moisture should seep -between the connecting surfaces at 28 f and 29, such moisture, because of the sleeve 24, could not pass into engagement with the threaded portion 25 of the connector, and accordingly, could not pass4 down along the conductor and into the insulation 20. Therefore, the insulation 20 is thoroughly protected by the arrangement shown against being moistgened and thereby prevented from having its dielectric strength weakened. In this way, the dielectric strength of the insulation around the electrical conductor is maintained, arcing is preventedl and the v' cable and the entire device are protected 'lis against destruction. i

l claim:

1. In combination, a casing for protecting an electrical conductor, an electricalconductor therein, an electrical" connector electrically connected to said conductor, a metal skirted nut closing and covering one end of said casing and screwed onto said connector, said skirted nut having a sleeve extending along a threaded portion of said connector, a cable lug monted over andembracing said sleeve of said nut, and a cap nut screwed onto said connector and extending over said sleeve, said sleeve. extending up beyondthe interengaging portions of said cable lug, skirted nut and cap nut whereby moisture is prevented from reaching the threaded portions Larmes of said members and is thereby prevented from reaching the enclosed conductor.

2. In combination, a casing for protecting an electrical conductor, an electrical conductor therein, a threaded electrical connector electrically connected thereto, and a closure for one end of said casing electrically connected to said connector and comprising a skirted nut, a cable lug and a cap nut, said skirted nut having a sleeve extending beyond interengaging portions of said cable lug, skirted nut and cap nut, whereby moisture is prevented from reaching the lenclosed conductor. Y

Signed at Chicago, Illinois, this 29 day of 0ctober, 1925. v

GERGE P. EDMONDS. 

